No energy saver in late 2008 macbook pro! Its just gone!

I used to have the energy saver option in my Macbook Pro and had it for maybe 3-4 days, but I powered it up a couple of days ago and it is just gone. I mean, it isn't even there in the prefs, there is nothing pertaining to it anywhere on my computer. I do some gaming and graphics work, so I really need that 9600gt, if there is a way to download it, that would be appreciated.

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